Use to add aftermarket speakers to factory door location. Speeds up installation time. Includes one pair for two doors- 2 plates and 2 speaker harnesses. Works with most 6 inch, 6.5 inch, and 6.75 inch speakers. Aftermarket speakers vary in size, width, depth, etc so even though it might be listed as a 6", 6.5" etc speaker, some speakers might require modification of the speaker adapter which is normal. Compatible vehicles: Made for Infiniti: 2003-2008 FX35 Front and Rear, 2003-2008 G35 Front and Rear, 2007-2015 G37 Front and Rear, 2006-2010 M45 Rear only, 2006-2010 M35 Rear only, 2008-2013 QX56 Rear only, 2014-2024 QX80 Rear only;; Made for Nissan: 2003-2009 350Z Front only, 2009-2020 370Z Front only, 1995-2018 Altima Sedan Front and Rear, 2007-2018 Altima Coupe Front only, 2004-2024 Armada Rear only, 2009-2014 Cube Front and Rear, 1998-2018 Frontier Rear only, 2022-2024 Frontier Rear only, 2009-2015 GT-R Front and Rear, 2011-2024 Leaf Front and Rear, 2018-2024 Kicks Rear only, 1995-2016 Maxima Front and Rear, 2003-2024 Murano Rear only, 2011-2018 NV Front only, 1995-2024 Pathfinder Rear only, 2004-2016 Quest Front and Rear, 2007-2018 Rogue Front and Rear, 2013-2024 Sentra Rear only, 2017-2024 Titan, Titan XD Rear only, 2007-2024 Versa Front and Rear, 2014-2019 Versa Note Front and Rear, 2000-2014 Xterra Rear only